This is a Tibbit module — part of the Tibbo Project System that allows you to build your own custom embedded device with only the components you need. Start with a Tibbo Project PCB, add Tibbits like this one, then place the built design into a Tibbo Project Box to complete your product.

Tibbit #04_3: Three optically isolated inputs with common (+). Inputs are fully isolated from system ground.

The picture to the right shows a different Tibbit, but the size, color and shape are the same.

If no external resistor is added, these inputs activate at about 2V. Forward current should not exceed 10mA; this caps the maximum input voltage at around 5V. Add external resistors if you need to apply higher input voltage.

Pins 6 and 12 are the GROUND and +5V power pins. Most Tibbit Modules consume (take) 5V power. There are also power supply Tibbits that generate 5V power from a variety of sources. Those output 5V through pin 12.

Pins 1 and 7 are for the additional +15V and -15V voltages. These are optional and only needed by few Tibbits. A special power supply Tibbit (#12) generates ±15V from the main 5V power.